钛合金表面氩弧熔覆原位合成TiB_2-TiN显微组织与形成机理  

Microstructure and Formation Mechanism of In-situ TiB_2-TiN in Titanium Alloy Surface by Argon Arc Cladding

作　　者：丁元柱[1] 梁刚[1] 

机构地区：[1]黑龙江科技学院,黑龙江哈尔滨150027

出　　处：《材料开发与应用》2012年第4期69-72,共4页Development and Application of Materials

摘　　要：以BN和Ni60A合金粉末作为预置涂层,采用氩弧热源在Ti6Al4V合金表面原位合成陶瓷颗粒复合涂层。经过热力学计算和扫描电子显微镜线扫描分析,利用X射线衍射仪进行涂层物相分析,确定陶瓷颗粒为TiB2和TiN。利用扫描电子显微镜观察微观组织形貌,并探讨TiB2-TiN颗粒的形成机理。实验结果表明,采用适宜的熔覆材料合金粉末成分和熔覆工艺参数,可以获得TiB2-TiN颗粒复合涂层,TiB2形态呈棒状和细条状,TiN形态呈颗粒状。颗粒尺寸细小,分布均匀,且与基体冶金结合。复合涂层的显微组织沿层深方向分为熔覆区、结合区和热影响区。With BN and Ni60A alloy powder as raw material and adopting the heat source of argon arc cladding,ceramic particle composite coat was in-situ synthesized on the Ti6Al4V alloy surface.Thermodynamic calculation,scanning electron microscope line scanning and X-ray diffraction analysis confirm that the ceramic particle is TiB2-TiN.The microstructure of the coating was observed under SEM,and the formation mechanism of the TiB2-TiN particles was investigated.The experimental results show that with appropriate alloy powder composition and cladding process parameters,TiB2-TiN particles composite coat is liable to form.The fine and even distributed particles are combined with matrix metallurgically.The microstructure of composite coating layer is divided into coating zone,bonding zone with and heat affected zone.The shape of TiB2 is bar and fine strip,and the TiN is granular.

关 键 词：氩弧熔覆 二硼化钛 氮化钛 

分 类 号：TG174.441[金属学及工艺—金属表面处理]